2 Samuel 20:18

Then she said, In the old days, there was a saying, Let them put the question in Abel and in Dan, saying, Has what was ordered by men of good faith in Israel ever come to an end?

Deuteronomy 20:10-11

When you come to a town, before attacking it, make an offer of peace.

Treasury of Scripture Knowledge

Summary

Then she spake, saying, They were wont to speak in old time, saying, They shall surely ask counsel at Abel: and so they ended the matter.

They were wont, etc

Bible References

They were wont, etc

Deuteronomy 20:10
When you come to a town, before attacking it, make an offer of peace.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain